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Related Medium and Heavy Trucks Questions
97 freightliner parking brake engages. Can't build enough
97 freightliner parking brake engages. Can't build enough air to back up slowly … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have 2007 International 9400i Cummins isx 435st. It's not
I have 2007 International 9400i Cummins isx 435st. It's not building up any air pressure. Changed the compressor, governor and dryer, still the same thing. The dryer an intermittent ticking coming fro… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
98 Pete n 14 select. it's slow about building air .will not
98 Pete n 14 select. it's slow about building air .will not build air at idle. Replaced dyrer.and governor. Pulled the intake pipe loose and the compressor is sucking air .pulled the main line off com… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
I have a 2007 freightliner columbia mbe4000 i cant get it to
I have a 2007 freightliner columbia mbe4000 i cant get it to built any air at all i replaced the dryer with governor on it I replaced the primary ait tank and check valve on fron of it along with all … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
Evening- At issue: 2005 freightliner with an MB4000 diesel
Evening- At issue: 2005 freightliner with an MB4000 diesel engine. The truck is not producing sufficient air pressure . at an idle it might get to 20 lbs. must be rev-ed to 1500 rpm for several minute… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I am working on a kw with a ad-is air dryer the compressor
i am working on a kw with a ad-is air dryer the compressor was replace a while back and I have no aie coming out of the dryier I thought the dryer was at falt so I replased it I still have nothing com… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
I have a 2010 international 7500 with problem building air
I have a 2010 international 7500 with problem building air pressure. When it intially starts, air builds to operating pressure. Then after brakes are used and pressure drops, it won't build back up ag… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
Having trouble with my air drier, keeps popping every 30
Having trouble with my air drier, keeps popping every 30 seconds or so. No leaks in any lines, new air drier, new compressor and air governor. If i place my hand under the purge valve after it "pops",… read more
FIX-IT
FIX-IT
Comercial transport technician
Vocational, Technical or Trade Scho
829 satisfied customers
2011 Peterbilt 320. Slow to build air pressure. Won't build
2011 Peterbilt 320. Slow to build air pressure. Won't build past 1oo psi at idle. Driving it builds air normally. @1500 rpm. it will build pressure but very slowly. No audible air leaks. By passed air… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
My '07 Kenworth W900 will not build air pressure. I had a similar
My '07 Kenworth W900 will not build air pressure. I had a similar problem last fall and replaced the air dryer with a reman air dryer (Bendix AD-IS) and new governor. That fixed the problem. A few wee… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have a 2012 KW T800 with 525 cummins. Wont build air. The
I have a 2012 KW T800 with 525 cummins. Wont build air. The compressor is pumping air to the ADIS air dryer but no air goes out to the tanks. I figured I would just replace the air dryer with a new on… read more
Jeremy
Jeremy
Certified Truck/Bus Technician
Associate Degree
2,756 satisfied customers
1999 international 4900 DT466e I cannot seem to get my air
1999 international 4900 DT466e I cannot seem to get my air compressor to build air. There is no air coming to my tanks it seems but the main line off of the compressor and going to the air dryer is ge… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
I have installed a new air compressor, governor and air
Good evening. I have installed a new air compressor, governor and air dryer. I drained all air tanks before start up and the new air dryer still purges constantly just like the old one. Will not build… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
1994 International 4900 with DT466 The truck has a new air
1994 International 4900 with DT466 The truck has a new air compressor and a new dryer. We are getting copious amounts of water in the tanks and cant figure out why. We also go through governors more t… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
I have 2010 Freightliner cadcadia dd15 , having problems with
I have 2010 Freightliner cadcadia dd15 , having problems with air not building up, secondary usually builds first , dryer pops Off when secondary air builds up, replaced dryer , check valve on 3rd tan… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
6,062 satisfied customers
I have already replace the air governor and I still have air
I have already replace the air governor and I still have air coming thru the exhaust side of the air governor the air dryer is not purging either. Is my unloader valve in the compressor bad?… read more
spankyjr1
spankyjr1
Retired
Vocational, Technical or Trade Scho
420 satisfied customers
1994 International 4900 wont build air pressure in cold.
1994 International 4900 wont build air pressure in cold. This is the only one of our trucks that has this problem and actually has the newest air compressor in the fleet. We drain the tanks religiousl… read more
Wayne
Wayne
Journeyman
Vocational, Technical or Trade Scho
17,353 satisfied customers
we are having problems with some of our trucks air lines
we are having problems with some of our trucks air lines freezing. We have instituted a protocol to drain their tanks everynight but it is still happening. Any tips or tricks?… read more
tkman55
tkman55
Shop manager Trailer Refrigeration shop
138 satisfied customers
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Meet the Experts:

Daniel Wilson

Daniel Wilson

6,062 satisfied customers

Owner at DJ Wilson

Cat Man

Cat Man

Cat Engine Expert

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I am ASE Master Truck Certified.

Wayne

Wayne

Journeyman

17,353 satisfied customers

worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling

Jeremy

Jeremy

Certified Truck/Bus Technician

2,756 satisfied customers

ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, Network Engineer specializing in CAN faults, Aftertertreatment, and vehicle communications

Curtis B.

Curtis B.

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cumminsdr

cumminsdr

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All types of Cummins applications

Chris (aka-Moose)

Chris (aka-Moose)

Technician

641 satisfied customers

24 years of experience diagnosing & repairing

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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